Donnie Saturno unboxes this ultra-compact design, which delivers 12 V / 3 A output, minimal component count, and impressive efficiency using a EF25 transformer and simple Schottky rectifier.

TinySwitch-5 switcher ICs feature a sophisticated control mechanism that dynamically adjusts switching behavior based on optocoupler feedback. In this reference design, the IC runs at 85 kHz, delivering 87%+ efficiency at 115 VAC and 89% at 230 VAC, all while staying under 60 mW no‑load power.

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